Make panels turn on or off shadow effect.

chrome/browser/ui/cocoa/panels/panel_cocoa.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/cocoa/panels/panel_cocoa.h"
 
 #include "base/logging.h"
 #import "chrome/browser/ui/cocoa/chrome_event_processing_window.h"
 #import "chrome/browser/ui/cocoa/panels/panel_titlebar_view_cocoa.h"
 #import "chrome/browser/ui/cocoa/panels/panel_utils_cocoa.h"
@@ skipping 254 matching lines @@
 
 void PanelCocoa::MinimizePanelBySystem() {
   NOTIMPLEMENTED();
 }
 
 bool PanelCocoa::IsPanelMinimizedBySystem() const {
   NOTIMPLEMENTED();
   return false;
 }
 
+void PanelCocoa::ShowShadow(bool show) {
+  [controller_ showShadow:show];
+}
+
 void PanelCocoa::PanelExpansionStateChanging(
     Panel::ExpansionState old_state, Panel::ExpansionState new_state) {
   [controller_ updateWindowLevel:(new_state != Panel::EXPANDED)];
 }
 
 void PanelCocoa::AttachWebContents(content::WebContents* contents) {
   [controller_ webContentsInserted:contents];
 }
 
 void PanelCocoa::DetachWebContents(content::WebContents* contents) {
@@ skipping 143 matching lines @@
       return ![[titlebar() restoreButton] isHidden];
     default:
       NOTREACHED();
   }
   return false;
 }
 
 panel::CornerStyle CocoaNativePanelTesting::GetWindowCornerStyle() const {
   return native_panel_window_->corner_style_;
 }